Tex. Transp. Code § 622.031
A vehicle used exclusively to transport milk may be operated on a public highway of this state only if:
Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.
Amended by Acts 2001, 77th Leg., ch. 941, Sec. 33, eff. Sept. 1, 2001.